GATE EE

Load Flow Studies

Power System Analysis

(Past Years Questions)

Marks 1

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A 1000 $$ \times $$ 1000 bus admittance matrix for an electric power system has 8000 non-zero elements. The minimum numb...
GATE EE 2018
The figure show the per-phase representation of a phase-shifting transformer connected between buses $$1$$ and $$2,$$ wh...
GATE EE 2017 Set 2
In a load flow problem solved by Newton-Raphson method with polar coordinates, the size of the Jacobian is $$\,100\,\, \...
GATE EE 2017 Set 2
A 10-bus power system consists of four generator buses indexed as G1, G2, G3, G4 and six load buses indexed as L1, L2, L...
GATE EE 2017 Set 1
A $$3$$-bus power system is shown in the figure below, where the diagonal elements of $$Y$$-bus matrix are: $${Y_{11}} =...
GATE EE 2017 Set 1
In a 100 bus power system, there are 10 generators. In a particular iteration of Newton Raphson load flow technique (in ...
GATE EE 2016 Set 1
The magnitude of three-phase fault currents at buses A and B of a power system are 10 pu and 8 pu, respectively. Neglect...
GATE EE 2016 Set 1
A $$3$$-bus power system network consists of $$3$$ transmission lines. The bus admittance matrix of the uncompensated sy...
GATE EE 2015 Set 2
A 183-bus power system has 150PQ buses and 32 PV buses. In the general case, to obtain the load flow solution using Newt...
GATE EE 2014 Set 3
The bus admittance matrix of a three-bus three-line system is $$y = j\left[ {\matrix{ { - 13} & {10} & 5 \cr {10...
GATE EE 2012
A power system consists of $$300$$ buses out of which $$20$$ buses are generator buses, $$25$$ buses are the ones with r...
GATE EE 2003
If the reference bus is changed in two load flow runs with same system data and power obtained for reference bus taken a...
GATE EE 1996
In load-flow analysis, a voltage-controlled bus is treated as a load bus in subsequent iteration for a _________limit is...
GATE EE 1995
In load flow analysis, the load connected at a bus is represented as
GATE EE 1993
In load flow studies of a power system, the quantities specified at a voltage-controlled bus are ____________and________...
GATE EE 1992

Marks 2

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The per-unit power output of a salient-pole generator which is connected to an infinite bus, is given by the expression,...
GATE EE 2018
The bus admittance matrix for a power system network is $$$\left[ {\matrix{ { - j39.9} & {j20} & {j20} \cr {j20}...
GATE EE 2017 Set 1
Determine the correctness or otherwise of the following Assertion (a) and the Reason (R). Assertion (A): Fast decoupled...
GATE EE 2015 Set 1
For a power system network with $$n$$ nodes, $${Z_{33}}$$ of its bus impedance matrix is $$j0.5$$ per unit. The voltage...
GATE EE 2013
In the following network, the voltage magnitudes at all buses are equal to $$1$$ p.u., the voltage phase angles are very...
GATE EE 2013
In the following network, the voltage magnitudes at all buses are equal to $$1$$ p.u., the voltage phase angles are very...
GATE EE 2013
A three–bus network is shown in the figure below indicating the p.u. impedances of each element The bus admittance mat...
GATE EE 2011
For the $${Y_{bus}}$$ matrix of a $$4$$-bus system given in per unit, the buses having shunt elements are $$${Y_{BUS}} =...
GATE EE 2009
The Gauss Seidel load flow method has following disadvantages. Tick the incorrect student.
GATE EE 2006
For a power system the admittance and impedance matrices for the fault studies are as follows. $$$\eqalign{ & {Y_{bus}...
GATE EE 2006
For a power system the admittance and impedance matrices for the fault studies are as follows. $$$\eqalign{ & {Y_{bus}...
GATE EE 2006
The network shown in the given figure has impedances in p.u. as indicated. The diagonal element $$Y22$$ of the bus admit...
GATE EE 2005
The bus impedance matrix of a $$4$$-bus power system is given by $$${Z_{bus}} = \left[ {\matrix{ {j0.3435} & {j0.2860...
GATE EE 2003
A power system consists of 2 areas (Area 1 and Area 2) connected by a single tie line (figure). It is required to carry ...
GATE EE 2002

Marks 5

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Two transposed $$3$$ phase lines run parallel to each other. The equation describing the voltage drop in both lines is ...
GATE EE 2002
For the $$Y$$-$$bus$$ matrix given in per unit values, where the first, second, third and fourth row refers to bus $$1,...
GATE EE 2001

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